Switching Power Supplies A - Z

2nd Edition

Authors: Sanjaya Maniktala
Hardcover ISBN: 9780123865335
eBook ISBN: 9780123865342
Imprint: Newnes
Published Date: 4th April 2012
Page Count: 768
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This book is the most comprehensive study available of the theoretical and practical aspects of controlling and measuring Electromagnetic Interference in switching power supplies, including input filter instability considerations.

The new edition is thoroughly revised with six completely new chapters, while the existing EMI chapters are expanded to include many more step-by-step numerical examples and key derivations and EMI mitigation techniques. New topics cover the length and breadth of modern switching power conversion techniques, lucidly explained in simple but thorough terms, now with uniquely detailed "wall-reference charts" providing easy access to even complex topics.

Key Features

  • Step-by-step and iterative approach for calculating high-frequency losses in forward converter transformers, including Proximity losses based on Dowell's equations
  • Thorough, yet uniquely simple design flow-chart for building DC-DC converters and their magnetic components under typical wide-input supply conditions
  • Step-by-step, solved examples for stabilizing control loops of all three major topologies, using either transconductance or conventional operational amplifiers, and either current-mode or voltage-mode control


Power supply design engineers, application engineers, IC systems designers, and students.

Table of Contents



Chapter 1. The Principles of Switching Power Conversion


Overview and Basic Terminology

Understanding the Inductor

Evolution of Switching Topologies

Chapter 2. DC–DC Converter Design and Magnetics

DC Transfer Functions

The DC Level and the “Swing” of the Inductor Current Waveform

Defining the AC, DC, and Peak Currents

Understanding the AC, DC, and Peak Currents

Defining the “Worst-Case” Input Voltage

The Current Ripple Ratio “r”

Relating r to the Inductance

The Optimum Value of r

Do We Mean Inductor? or Inductance?

How Inductance and Inductor Size Depend on Load Current

How Vendors Specify the Current Rating of an Off-the-shelf Inductor and How to Select It

What Is the Inductor Current Rating We Need to Consider for a Given Application?

The Spread and Tolerance of the Current Limit

Worked Example (1)

Worked Examples (2, 3, and 4)

Worked Example (5) — When Not to Increase the Number of Turns

Worked Example (6) — Characterizing an Off-the-Shelf Inductor in a Specific Application

Calculating “Other” Worst-case Stresses and their Selection Criteria

Chapter 3. Off-Line Converter Design and Magnetics

Flyback Converter Magnetics

Chapter 4. The Topology FAQ

Questions and Answers

Chapter 5. Advanced Magnetics

Part 1: Energy Transfer Principles

Part 2: Energy to Core Sizes

Part 3: Toroids to E-Cores

Part 4: More on AC–DC Flyback Transformer Design

Part 5: More on AC–DC Forward Converter Transformer Design

Chapter 6. Component Ratings, Stresses, Reliability, and Life


Stresses and Derating

Part 1: Ratings and Derating in Power Converter Applications

Part 2: MTBF, Failure Rate


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About the Author

Sanjaya Maniktala

Affiliations and Expertise

Principal Engineer, National Semiconductor, Santa Clara, CA, USA